*mlockall(2)* man page has more details.
[[pidfile]]*pidfile* _file_::
-*chronyd* always writes its process ID (PID) to a file, and checks this file on
-startup to see if another *chronyd* might already be running on the system. By
-default, the file used is _@DEFAULT_PID_FILE@_. The *pidfile* directive
-allows the name to be changed, e.g.:
+Unless *chronyd* is started with the *-Q* option, it writes its process ID
+(PID) to a file, and checks this file on startup to see if another *chronyd*
+might already be running on the system. By default, the file used is
+_@DEFAULT_PID_FILE@_. The *pidfile* directive allows the name to be changed,
+e.g.:
+
----
pidfile /run/chronyd.pid